2、情态动词的进行式
情态动词+行为动词进行式（即情态动词+ be + v-ing形式），表示推测或评论某动作现在是否正在进行。例如：
The light in his study is still on; he must be working now.
他书房的灯还亮着，想必他现在还在工作。
She shouldn´t be working like that. She is still very weak.
她不应该这样干,她身体还这样弱.
He can´t be telling the truth. 他说的不可能是真话.
3、情态动词的完成进行式
情态动词+行为动词完成进行式（即情态动词+ have been + v-ing 形式），表示推测或评论过去某动作是否正在进行或一直在进行。例如：
They are sweating all over. They must have been working in the fields.
他们浑身是汗，准是在地里一直干活来着。
They may have been discussing this suggestion all the morning.
今天上午他们可能一直在讨论这个建议来着。
二、特殊情态动词
除了上述的基本情态动词之外，还有一些如would rather, would sooner, would (just) as soon, had rather, had better, had sooner, can not but, may (just) as well等可用作情态动词。
The soldier would sooner die than surrender. 这个战士宁死不降。
If you don´t like to swim, you may just as well stay at home.
如果你不喜欢游泳，你也可以待在家里啊。
这些短语后一般直接跟动词原形。但是当would (had) rather, would (had) sooner, would (just) as soon后可跟that 引导的从句时，从句就要用虚拟语气。对现在和将来的假设用过去时，对过去的假设用过去完成时。例如：
I would rather you went home right now.我倒宁愿你现在立刻回家去。
I would sooner you hadn´t asked me to speak yesterday.
我倒宁愿你昨天没邀请我讲话
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